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Countries with nuclear weapons

Satellite images of North Korea's Yongbyon nuclear facility suggest it has restarted a plutonium production reactor, once again raising worries about the hermit country's nuclear weapons program. But how many weapons does North Korea -- or any other country, for that matter -- actually have? The Federation of American Scientists has some estimates here:

The total inventory is all the weapons a country is believed to have, including stockpiles. Operational strategic weapons are functioning weapons designed to hit specific targets.